Get an API client ID

IRS application program interfaces (APIs) allow communication directly with the IRS for these products:

• e-Services – Taxpayer Identification Number (TIN) Matching, Transcript Delivery System (TDS), and Secure Object Repository (SOR)
• Electronic Filing Identification Number (EFIN) Validation and Vendor Control Number (VCN) Registration
• Income Verification Express Service (IVES) – Forms-based processing system
• Information Return Intake System (IRIS) – E-file information returns

Before you can use an IRS API, you need an approved application granting access to the product and a client ID.

To get an API client ID, follow these steps:

1. Review the product user guide

The user guide provides system requirements for the product:

• e-Services TIN Matching, TDS and SOR Contact the Help Desk at 866-255-0654.
• EFIN Validation and VCN – Contact the Help Desk at 866-255-0654.
• IVES Application to Application (A2A) - Get user guides in IVES Application to Application. 
• IRIS Application to Application (A2A) - Find system requirements in Information Returns Intake System (IRIS) Electronic Filing Application to Application (A2A) Specifications, Publication 5718 PDF. For questions, call the Help Desk at 866-937-4130.

2. Complete or modify an API client ID application

You must complete an application to request an API client ID.

To complete or modify your application, sign in or create an account.

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